Anybody who watches others is an observer of behaviour.
Overt: Can be outwardly seen/ sensed by an observer.Covert: Cannot be outwardly seen/ sensed by an observer.
Observer is a noun.
The German translation of observer is Beobachter.
The Observer EP was created in 2003.
Leitrim Observer was created in 1904.
Argus Observer was created in 1897.
Evening Observer was created in 1882.
Liberian Observer was created in 1981.
Legon Observer was created in 1966.
The Vancouver Observer was created in 2006.
Nigerian Observer was created in 1968.
Manchester Observer ended in 1828.